<!DOCTYPE html>
<html>
<head>
	<meta charset="utf-8">
	<title></title>
	<script type="text/javascript">
		 var arr = [
	        [1001,'tom','jack','chris'],
	        [1002,'apple','orange','tomato'],
	        [1003,'HTML','CSS','JS']
	    ];
	    for( var i=0;i<arr.length;i++ ){
	    	// arr[0]  [1001,'tom','jack','chris']
	    	// arr[1]  [1002,'apple','orange','tomato']
	    	// arr[2]  [1003,'HTML','CSS','JS']
	    	for( var j=0;j<arr[i].length;j++ ){
	    		console.log( arr[i][j] );// arr[1] [1002,'apple','orange','tomato']
	    	}
	    }
	</script>
</head>
<body>

</body>
</html